Effect of ammonium fixation and displacement on the added nitrogen interaction in incubation experiments |
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| Authors: | F. Azam F. W. Simmons R. L. Mulvaney |
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| Affiliation: | (1) Soil Biology Division, Nuclear Institute for Agriculture and Biology, Faisalabad, Pakistan;(2) Department of Agronomy, University of Illinois, 61801 Urbana, IL, USA |
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| Abstract: | A laboratory incubation experiment was conducted to study the effect of NH4+fixation/defixation on the added N interaction (ANI) in three Illinois Mollisols fertilized with 100 or 200 mg N kg-1 soil. A positive ANI was observed in all three soils, which was greater at the higher rate of applied N. However, very little exchange was observed between applied 15NH4+and the native clay-fixed NH4+, and the ANI observed were attributed largely to microbial immobilization-mineralization. The results suggested that variations in the NH4+fixation capacity of soils will not have a significant bearing on the interpretation of data obtained from studies of the ANI. |
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| Keywords: | Added N interaction Ammonium fixation N immobilization N mineralization Priming effect |
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